Jon

This is a truth that many people overlook. Many WS flux/paste
chemistries use amine- or amino acid-hydrohalide activators and these
have a behaviour like egg white - they dissolve well in cold but set at
higher temps in the presence of water. I recommend a max of 50°C for the
wash cycle with these. Rinse temps can be progressively higher. If a
prewash is possible (or use of a chelating neutraliser, which I
recommend), then this is best at cold.

Brian

Jon Moore wrote:
>
> Janice,
>      What temperatures are your wash / rinse cycles?  I found white residues
> routinely with water soluble chemistries and OSP panels following wave
> solder, and it turned out that my temperatures were set too high.
>
> Jon Moore
>
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